FORD 2013 F-550 v.3 - Manual (Page 188)

• Make sure that when in operation, the extension cord plug and the
heater cord plug connections are free and clear of water. This could
cause an electric shock or fire.
• Make sure your vehicle is parked in a clean area, clear of
combustibles.
• Make sure the heater, heater cord and extension cord are firmly
connected.
• Check for heat anywhere in the electrical hookup once the system has
been operating for approximately 30 minutes.
• Make sure the system is unplugged and properly stowed before driving
your vehicle. Make sure the protective cover seals the prongs of the
block heater cord plug when not in use.
• Keep plug terminals clean and free of dirt and corrosion.
• Make sure the heater system is checked for proper operation before
winter.
Using the Engine Block Heater
Make sure the receptacle terminals are clean and dry prior to use.
Clean them with a dry cloth, if necessary.
The heater uses 0.4 to 1.0 kilowatt-hours of energy per hour of use.
The system does not have a thermostat. It achieves maximum
temperature after approximately three hours of operation. Using the
heater longer than three hours does not improve system performance
and unnecessarily uses electricity.
Starting and Stopping the Engine 187
2013 F-250/350/450/550 (f23)
Owners Guide gf, 3rd Printing, December 2012
USA (fus)